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TABLE OF CONTENTS 



i. 



3, Holes for carrying the Reising submachine guQ * 

II. Description 

A. General — — * 

B, Operation— 3 

C- General data * 

D. Miscellaneous data * 

E, Nomecclatii re of component parts.. ' 

III, Disassembly and assembly- *j* 

A. General — -- |J 

B. Field disassembly 10 

C. Field assembly--- 11 

D. Detailed disassembly n 

E. Detailed assembly U 

1 2 
IV- Care and cleaning 

A. General jj 

B. Bore-. — ... ** 

C. Chamber.--^ l2 

D. Exterior surfaces I2 

E. Magazines — l /r 

F. Lubrication, * 

V- Functioning 

A. GeueiBl ™ 

B- Firet phase jj 

C, Second phase 

D. Third phase H 

VI. Stoppages and immediate action 14 

A. Immediate action in misfires.*. 14 

B. Immediate action in other stoppages,. * 5 

VIL Spare parte and accessory, sets jjj 

VIII. Safety precatitions j* 

A. Before firing jj| 

B- During firing ™ 

IX. Inspection, adjustment, and repair j*| 

A. General— JJ 

B. fielwtor eet at "S. A." 17 

a Seleetorset at "F. A." 17 

D- Selector set at "Safe" 18 

E- Summary *J 

F. Table of defects and repairs iS 

Notes. — M&5 parachute V'~"" ^ 

Annex No. 1. List of parts arranged according to manufacturer's piece 

numbers 



THE REISENG SUBMACHINE GUN, CALIBER .45, 

MODELS 50, 55, AND 60 

I. RULES FOR CARRYING THE REISING SUBMACHINE 

GUN 

Unless otherwise prescribed^ the Reising submachine gun (with or 
without magazine) is habitually carried slung over the right shoulder, 
butt down, barrel to the rear, right hand grasping the sling, hand 

in front of armpit. 

For marches and field exercises, the Reising submachine gun may 

be carried slung over either shoulder. 
When troops are at ease, the piece is kept slung unless otherwise 

ordered* 

When troops are at rest, the piece may be unslung and held in any 
convenient position. 

Only the following movements of the manual are executed by men 

armed with the Reising submachine gun. 

(1) Parade Rest. — If at sling arms, execute as without arms keep- 
ing the right hand on the sling. 

(2) Inspection Akms : 

Being at SLING ARMS, at the preparatory command INSPEC- 
TION, the left hand grasps the piece just below the magazine guide 
and carries the piece diagonally across the body. At the same time, 

the right arm is disengaged from between the sling and the weapon, 
the right hand grasping the small of the stock when the left hand is 
in front of the center of the body. The left hand then encircles the 
magazine, fingers to the front, thumb to the rear, thumb and forefinger 
pressing against the magazine catch. The magazine is withdrawn 
by the left hand and placed in the belt or pocket, and the piece is 
regrasped by the left hand just below the magazine guide. At the 
command of execution ARMS, the thumb of the left hand retracts the 
action bar, the fingers of the left hand grasping the pie«e when the 
action b*ir is fully retracted. Lower the head and eyes slightly and 
at the same time turn the piece sharply, barrel to the rear> sufficiently 




(1) 






to glance into the chamber. Having found no cartridges in the cham- 
ber, the piece is turned sharply barrel up, at the same time raising the 
head and eyes to the position of attention. 

(3) Being at Inspection Asms.— At the next preparatory command, 
release the action bar, pull the trigger, remove the magazine from the 
belt or pocket, insert in the piece, and regrasp the piece with the left 
hand just below the magazine guide. At the command of execution, 

execute SLING ASMS, 

Men armed with the Keising submachine gun salute with the hand 
salute when not in ranks. In ranks, they do not salute. 

II. DESCRIPTION 

A, GENERAL 

The Rising submachine gun, caliber .45, Model 50, 55, or 60, is 
an air-cooled, delayed blow-back, magazine-fed hand or shoulder 
weapon, which may be fired from any position and with one or both 

a The exterior surface of the rear part of the barrel is made with 
radial flanges or cooling fins, which radiate the heat from the barrel 
during firing, thus cooling the barrel. 
The type of fire is selective, either automatic or semiautomatic. 

The weapon is fed from a box-type magazine, having a capacity of 
".0 rounds, and is intended for, and capable of, intensive fire against 
personnel within a range of 300 yards. 

When a round is fired, the blow-back, delayed by the friction of 
cammed surfaces and the resistance of the action bar spring, is utilized 
to force the action bar and bolt to the rear, unlocking the bolt, extract- 
ing and ejecting the fired cartridge case, recocking the hammer, and 
compressing the action bar spring. 

On termination of the rearward motion of the action bar and bolt, 
the action bar spring causes the action bar and bolt to move forward. 
During the forward motion, a cartridge is stripped from the magazine 
by the feed rib of the bolt and chambered. On termination of the 
forward motion, the weapon is loaded, the bolt locked, and the piece 

ready for firing. 
The same mechanism is used in Models 50, 55, and 60. The model 

numbers indicate differences in stock or barrel length. 

Model 50 is distinguished by its conventional rifle stock and by 
the addition of a compensator. This model is fitted with an 11-inch 
barrel and has the general appearance of a carbine. 



Model 55 is distinguished by its folding steel stock which gives 

the weapon unusual compactness. 

Model 60 is similar to Model 50 but is fitted with an 18-inch barrel, 

and is capable only of semiautomatic fire. Tt is not fitted with a 

connector. 

B. OPERATION 

The submachine gun is designed to fire cartridges, ball or tracer, 
caliber .45, M1U11 or similar. The magazine holds 20 cartridges. 
Although more than 20 cartridges may be loaded into the magazine, 

such practice may result in a malfunction. 

When the selector is set on "F. A." or "Full Automatic," the piece 
will fire as long as the trigger is depressed or cartridges remain m 
the magazine. 

When the selector is set on "S. A." or "Semiautomatic,*' the piece 
will fire once each time the trigger is depressed and until the 

magazine is emptied. 
When the selector is set on '"Safe," the piece cannot be fired. 

Not*. — Before moving the selector from "P. A. " retract the action bar about 
one-fourth Inch to allow connector to disengage from the action bar, should 
it he so engaged. 

Magazines are inserted into the magazine guide and pressed up- 
ward until engaged by the magazine catch. 

Magazines are released by pressing the magazine catch to the rear 
and withdrawing the magazine. On later models, the new type two- 
way release magazine catch release permits magazine removal with 
one hand, by pushing forward on the magazine release and with- 
drawing the magazine with the fingers of the same hand. 

To prepare the gun for firing with a loaded magazine seated in 
the magazine guide, retract the action bar with the left forefinger, 
thus cocking the firing mechanism. When th-A action bar is fnlly 
retracted, remove the forefinger and allow the action bar to snap 
forward, thus loading and locking the piece. The piece may now be 
fired by depressing the trigger. 

The rear sight is adjustable to ranges of 50, 100, 200, and 300 
yards by raising the rear sight and sliding the elevator forward or 
back until the ears of the rear sight are able to engage in the desired 
cuts in the elevator. 



; 



A 





C GENERAL DATA 

{Lengths and weights are approximate) 
(1) Dimensions.— 
(a) Barrel: 

Diameter of bore . „lnche« — 0.45 

Ncmber of grooves -- - * 

Twist In rifling, uniform, right one turn in inches-™ lfl 

Length or barrel, Model 60 do 11- &*> 

Length of barrel, Model 55 da 1ft 00 

Length of barrel. Mortal W -. do ls - Qa 











O 



4 587 09— 42- 










I 

t 

(1) ZHmenaions — Continued, ^^ v 
(&) Qua; 

OTer-all length trf Model 50, including compensator Inches^, 35.25 

Overall length of Model 65 . fla 22.28 

Length of JMure] and receiver w/q compensator. Model 56 do 19. 00 

Sight radius. Models SO, 56 „ do JS.00 

Length of compensator m —flo^- 3. 2& 

Sight radios, Modes 60 , „_do 25.00 

(2) Weights. — 
(o> Qun; 

Model CO w/o magazine— _^ pounds— 6.7B 

Model 55, w/o magasine do 6.25 

Model 6» r w/o roagaselne do 7.00 



6 



(2) Weight*— Continued., 
(ft) Magazine: 

Loaded Ground magazine pounds— 1- 40 

Empty Ground magazine do a 35 

D. MISCELLANEOUS DATA 
( Approximate) 

Initial velocity feet per second— 920 

Pressure ia chamber, pounds per square inch 12,000-16,000 

Weight of cartridge, ball grains— 325 

Weight of bullet do____ 234 

Weight of powder charge- , _flo j; 

Cyclic rate of fir?, shots per minute 450-500 

E- NOMENCLATIVE OF COMPONENT PARTS 

ft) Subtnaohine gun — 
L Action Bar 

a. Camming lug, 

6- Connector recess. 

c. Fingerpiew, 

d. Guide. 

2. Action bar spring. 

3. Actios} bar spring guide. 

4. Automatic connector. 

0* Hook. 
h. Hear arm. 
c Stud. 
■5* Barrel. 

6. Bolt. 

0,+ Camming recess. 

&» Feed rib. 

7. Bumper ping. 

a* Guide. 

8. Bumper plug plunger. 

9. Bumper plug plunger spring, 
10. Compensator (Models 50, CO). 
1JL Connector plunger. 

12, Connector plunger spring. 

13. Disconnector. 

M. Disconnector pin. 
lo Disconnect or spring. 

16 Ejector. 

17. Extractor. 

18. Extractor screw. 

19. Firing pin. 



{ 1 ) JSub mac )mie gun — Continued . 

20. Firing pin retaining pin- 

21. Firing pin spring. 

22. Front sight 

23. Front sight screw. 

24. Hammer. 

25. Hammer spring. 
26* Magazine catch. 




CW3 i*P 








1*1 



- »• *V 



.** r 1 



* — .-_ * 



r** 



•«J 



• J7. 






*r. fJ-s 



•fif 




-J* 




fY. 



f* 



*J- 



'J* 





nr 



FrouRK 4. 



27. 
29. 



Magazine catch screw. 

Magazine guide/ 

#. Magazine stop. 

Magazine guide pins (21 



8 



A 



( 1 ) Submachine gun — Oontinu ed, 

30. Receiver. 

a. Magazine guide po&t, front 
4. Magazine guide post. rear. 

c* Sear post. 
^- Trigger post* 

31. Bear sight. 

a. Ears, 

39. Rear sight elevator. 

#. Cuts. 

33. Sear. 

34. Sear pin- 

35. Sear spring, 

36. Selector. 

#, Extension. 

37. Selector screws (2). 

38. Selector spring, 

^y Trigger- 
Hi. Extension. 
b. Stud. 

40. Trigger pin. 

41. Trigger plunger. 

42. Trigger plunger spring. 
Magazine : 

43. Floor plate- 

44. Follower, 

45. Spring. 
4fi. Tube. 

Stock, Model 55 : 

47. Bracket- screw, front. 

48. Bracket screw, rear. 

49. Escutcheon. 

50. Escutcheon nails (2), 

5L Folding steel stock. 

5£. Folding steel stock hinge. 

53. Folding steel stock hinge bracket, 

54. Folding steel stock latch. 

55. Front swivel. 

56. Hinge screws (2) . 

57. Latch screws (2). 
o& RearswiveL 

ol?< Hear swivel boll 

60. Bear swivel nut, 

61. Hear swivel escutcheon. 



9 



Stock, Model 55— Continued. 

62, Stock, Model 55. 

63. Take- down screw, 
di. Trigger guard. 

65. Trigg*? guard screw, front, 
f^ -X"r?jrger r;»iHrd Rcetr, rear. 
S.-;J:3^ "pls-^andW: 

67 B'itt pint*. 
'>S. Bti*t. plate screws. (2) . 
-VJ. ;»tcck, Models 50 ar=d 60. 
: : ; t>c'? tehc.cn.. 
:"v» *^:utcheon nails (2 1 ). 
vft, *. Aown screw, 
"A ... ,gsr guard. 
rt. %'jfe^J" guard screw, front . 

.-? i- - rs* 3 * g uara sc rPw i r *- 1 '- 

ill. DISASSEMBLY AND ASSEMBLY 

i* . GEN FT. i I 

Disasspijbly 35 conjured under nvc separate headings; fM <***- 
ownftlv. ^d <fefo»W dvmsemMv Field disassembly ant»Js such 
dismount of the weapon as is necessary to indicate cfe^*^ * ; f f 
feto, «nfi 3«4p» a pinilnuim ib-joW of parts or groups of parts 
bein- removed fwm the weapon. Detailed disasFcanbly is the com- 
nikte disa^blv of all d*monm*bfe parts of the weapon and is done 
IrJy fiy cc-m.-pe.Uiit qualified jvnowu* for purposes of inspection, 
adjustment, repair or replacement -si parts. 

B. FIELD DISASSEMBLY 

Remove mradne bv pntffeg a^gp^re cafeh. After determining 
that the gu"! s unloaded, tej B un on table, barrel down, muzzle to 
left Prscrew take-down screw and remove stock. Pull trigger to 
relieve tension of hammer spring. Unscrew bumper plug and remove 
hammer and spring, holding back on trigger. Push action bar to 
rear so that dismounting hole in action bar guide is visible. Insert 
end of hammer spring in dismounting hole. Push out magazine 
*Tiide pins, use gun hammer if necessary, right to left Remove 
magazine guide. (The magazine posts and magazine guide pins are 
tnpered (3*. 4 standard taper pin reamer). The magazine guide 
may be used as a screwdriver to remove bumper plug). Set pe 
selector on F. A^ bold up ends of connector and disconnector with 
forefinger of right hand and with left hand lift forwar' -• ' oi -- uon 
bar *** 90° angle. Using c?re so that no strain is put on c^reci-- 



10 



and disconnector, twist out action bar. Point muzzle up, pull trigger 
and bolt will drop out The piece is now field disassembled. 

Note. — l/o not chance a-ttjuttment of Connector, Disconnector or Selector. 
{Magazine may be diaatsemlled by removing floor plain. \ 

C FIELD ASSEMBLY 

The procedure of disassembly is reversed for assembling. With 
trigger depressed , place bolt in receiver and slide it forward. Insert 
hammer, pull trigger, and hammer Trill fall on bolt. Lift ends of 
connector and disconnector and replace action bar, twisting it in 
under the ends of the connector and disconnector and laying it in 
place, action bar camming big in bolt camming recess. Replace mag- 
azine guide and pins. Insert action bar spring guide in seat In post 
and remove hammer spring from dismounting hole. Replace ham- 
mer spring in receiver. Screw bumper plug into place. Repkee 
stock and tighten take-down screw. 

D. DETAILED DISASSEMBLY 

Disassemble as in Feeld Disassembly. Keliex'e tension v „i trigger 
pin by pressing down trigger to receiver and push out trigger pin. 
Remove trigger and disconnector assembly. Relieve tension on sear 
pin and push out same. Remove sear and automatic connector. 
Unscrew selector screws and remove selector and selector spring. 
Push out firing pin, retaining pin from bolt and remove firing pin 
and spring. Do not remove extractor and extractor screw from boh 
unless prepared to reset extractor screw to prevent its backing out 
during firing. Remove connector plunger and spring from sear post. 
Bo not attempt to remove bumper plug plunger and spring from 
seat in receiver. Remove hammer spring from actio:: bar spring 
guide allowing action bar spring and guide to be diEassemblirJ from 
action bar. Remove springs from sear, connecter plunger, trigger 
plunger, and forward part cf trigger {disconnector spring). 

.Note.— Do not rensove extractor and extractor screw £*?n> onir. except as 

noted above Do not try to remove bumper plug pluug-er and spring from 
receiver. 

E. DETAILED ASSEMBLY 

Assembly is accomplished in reverse order. Replace trigger 
pl-swrer and spring and disconnector spring in trigger. Replace 
conneu ■ r plunger and spring in sear post, sear spring in sear. 
flatteL . . end of sear spring out. Reassemble action bar spring and 
guide to action bar and insert end of hammer spring in dismounting 
hole of action bar spring guide, compres^ng action bar spring by 
placing finger piece of action bar against ^dge of table or similar 



II 



r 

X 



stop and pressing forward on action bar spring guide. Reassemble 
tali. Replace selector on receiver, lay selector spring on selector 
and screw into place with selector screws. Lay connector stud in 
coTsnsctor stud hole in sear and replace this assembly in sear post, 
securing with sear pin. Trigger and disconnector assembly is then 
replaced in trigger post and trigger pin inserted. Continue as in 
Field Assembly. 

IV. CARE AND CLEANING 

A. GENERAL 

AliJiough this weapon will generally function under extremely 
adverse conditions, it is necessary to give it proper care and treat- 
ment to ensure best results. The gun should be kept well cleaned 
and working parts lubricated with a light film of oil, or standard 
cleaner- After firing, the piece should be field disassembled and all 
parts cleaned which have come in contact with powder gases. The 
f'z&e of the bolt and the firing fin should be cleaned. The firing pin 
spring is made of beryllium, copper and U nojieorrosive. 

B, BORE 

Clean bore with warm soapy water when available or with standard 
cleaner. It is imperative that the bore he cleaned with either water 
or standard cleaner to dissolve the primer suits. Run cleaning brush 
through bore several times, pus rung brush through bore all the 
way so that bristles of brush will reverse outside the bore each time. 
Run several wet patches through the bore. Dry out bore with clean 
patches until patches come out clean and dry. Bun patch saturated 
with oil or standard cleaner through, bore. Sea that the compensator 

is 'not fouled by the cloth patch. 

C. CHAMBER 

Special attention should be accorded the cleaning of the chamber 
when cleaning the bore. 

D. EXTERIOR SURFACES, 

Wipe off dampness and dirt from exterior surfaces of gun with 
dry cloth. Wipe all metal surfaces with an oiled rag. 

E. MAGAZINES 

Magazines that have been exposed to use in the field should be dis- 
assembled and thoroughly cleaned and then wiped lightly with an 
oiled rag. DO NOT DRENCH THE MAGAZINES OR AMMU- 
NITION WITH OIL. 



12 



F. LUBRICATION 

This submachine gun has no provision for lubrication nor is there 
a need for it. A light film of oil on all working parts is sufficient, 
lubrication; too much oil tends to slow down the mechanism. 

V. FUNCTIONING 

A. GENERAL 

In order to simplify the explanation of functioning, the cycle has 
been divided into three phases, each of which is explained separately. 
These phases are: First phase, backward movement of recoiling parts: 
second phase, forward movement of recoiling parts; and, third phase, 
action of trigger mechanism. 

B. FIRST PHASE 

The first phase of functioning begins with the piece loaded and 
ready to fire. The hammer spring lias been compressed and the 
hammer is held in a cocked position by the sear. There are two 
notches m ths hammer. The front notch functions in event of a 
weak powder charge. Every shot in semiautomatic fire and each 
first shot of a burst of full automatic fire is fired through the. direct 
action of the disconnector. When the trigger is pressed, the dis- 
connector, which is assembled to the trigger, is caused to move for- 
ward, and since the disconnector is in engagement with the sear, the 
sear rotates on its pin and releases the hammer. The released ham- 
mer, under action of the rompressed hammer spring, strikes the tiring 
pin which transmits the blow to the primer of the chambered car- 
tridge. Unless the boll is in its fully locked position, the piece will 
not nre, for the firing pin will enter the hole m the hammer, TJs.- 
expanding gases, formed by the discharge of the cartridge, exeix um, 
sure against the face of the bolt, causing the bolt :'o unlock and move 
to the rear. The camming recess in the bolt, working or. the cam- 
ming lug of the action bar, moves the action bar rearward with the 
bolt, compressing the action bar spring. The bolt- is cammed out of 
the locking shoulder in the receiver and the resistance of the action 
bar spring delays the overcoming of the inertia of the moving parts 
until die bullet has left the muzzle and chamber pressures have sub- 
sided. As the bolt moves to the rear, the extractor and residual 
pressure extracts the empty cartridge case which is cammed out 
through the ejection opening when the ejector comes in contact with 
the case. During this rearward action, the action bar cams the dis- 
connector out of engagement with the sear, allowing the sear to en- 
gage the hammer under action of the sear spring. The hammer 
spring is compressed over the guide in the bumper plug. When pres- 
sure on the trigger is released, the disconnector engages the sear once 
mere under action of the disconnector spring. 

13 



A 



C. SECOND PHASE 

The second phase of action is the forward movement of the action 
bar and bolt under the action of the compressed action bar spring. 
The feed rib of the bolt strips the top cartridge from the magazine 
and carries it into the chamber. The bolt, nearing its foremost posi- 
tion, is cammed up into the locking shoulder of the receiver by the 
jamming lug of the action bar working in the camming recess in the 
bolt- The piece is now loaded and cocked, ready to be fired. 

D. THIRD PHASE 

VI) Selector set at "S. A. rt With the selector in this position, the 
extension of the selector holds the automatic connector out of the path 
of the action bar and the piece fires one shot each time the trigger 
is rtpnwffi^'l as described in the Fthst Phase. 

12) Selector set at "F. A." The first shot of any string of shots 
6r«d full automatic is fired through file action of the disconnector 
as debiiibed in the First Phase. Since the extension on the selector 
3^o longer prevents the connector fmn engaging pith the action bar, 
End since pressure on the trigger has not been released, the hook of 
thd connector rises into the connector recess in the reaT of the action 
bar under the action of the connect «r plunger spring. When the 
bolt and action bar have gent; almost completely forward into a locked 
position, the action bar exerts a puii uii the connector, which, being 
attached to *he sear, causes the sear to rotate on its pin and release 
he hammer, thus causing the piece to fire. This same action con- 
inues until the magazine has been emptied or th* trigger released. 
Upon releasing pressure, the trigger, under action of the trigger 
plunger spring, rotates on its pin and the trigger stud bears against 
the rear arm of the connector, forcing the connector out of the path 
of the action bar. The disconnector then reengages the sear. 

(3) Selector set at "Safe."' At this Betting the extension of the 
selector disengages the disconnector from the sear and prevents move- 
ment of the connector. The piece cannot be fireiL 

VL STOPPAGES AND IMMEDIATE ACTION 

A. IMMEDIATE ACTION IN MISFIRES 

In the event of misfire, retract action bar smartly to eject misfired 
cartridge. Should round remain in chamber, allow action bar to 
snap forward and again attempt to fire. 






14 



B. IMMEDIATE ACTION IN OTHER STOPPAGES 

(1) Retract action bar, set seleet-or on "Safe," and allow empty 
case or cartridge to fall through ejection opening by turning gun 
right side down; reload, reset selector and resume firing. 

(2) If gun still fails to function, change magazine, reload, and 
resume firing. 

VI L SPARE PARTS AND ACCESSORY, SETS 

The following parts and accessories are distributed for each 10 
guns, Seising, submachine, caliber .45; < except as noted below). 
1 catch, magazine, 50-29. 
1 connector, automatic, 50-51. 
I disconnector, 50-1 0. 
1 extractor, 50-14. 
1 guide, retracting spring, 50-156. 
1 pin, bolt, 50-4. 
1 pin, disconnector, 50-12. 
1 pin, firing, 50-16. 
1 pin, magazine guide. 50-28. 
1 pin, sear and trigger, 50-47. 
1 plunger, trigger spring, 50-BQ. 
1 plunger, automatic, connector spring. 50-79. 
1 safety and fire control, 50-38. 
1 screw, extractor, 50-15, 
1 screw, magazine catch, 50-30. 
1 screw, safety, 50-39. 

1 screw, take-down (complete), 5(^45. 
1 sear, 50-41. 

1 sight, front, 50-19, with screw, front sight, 55-35, assembled - 

1 spring, disconnector, 50-11. 

1 spring, firing pin, 50-17. 

1 spring, hammer, 50-21. 

1 spring, retracting, 5CMJ7. 

1 spring, safety, 50-40. 

1 spring, sear, 50-42, 

1 spring, trigger, 50-48. 

1 spring, automatic connector, 50-52. 

2 magazines, 20- round assembly, extra per gun. 1 



JO magazines per year are tarnished to combat orgMUMtfcwis. 



15 



.- 

1 




1 brush } cleaning, Reising submachine gun, per gun. 

1 chart, instructions, Reising submachine gun, per 50 guns, or 

fraction thereof. 
1 pamphlet, Reising submachine gun, per 10 guns. 
J. rod, cleaning, Reising submachine gun, per gun. 
1 sling, strap, per gun. 
1 case, 5-pocket, 20-round magazine (TSMG), per gun/ 

VIIL SAFETY PRECAUTIONS 

A. BEFORE FIRING 

1. See that bore is clean and clear. 

2. Work action bar several times to see that operation is smooth. 

3. Try trigger mechanism on the settings of the selector. 

4. Inspect magazines and eliminate faulty ones. 

5. See. that magazines are clean and properly loaded. 

R DURING FIRING 

1. During target practice, insert, loaded magazine only on order 

from range officer. 

2. Set the selector at* 'Safe" while inserting the magazine. 

3. Keep selector on "Saie" until gun is raised to fire. 

4. Put finger on trigger only when gun is pointed at target. 

5. Keep gun pointed at target while magazine is in gun. 

6. Ketract action bar about one -fourth inch to allow connector to 
diFengHge "from action bar after tVe last shot has been fired B F. A/ 1 

T. To clear giai, remove nuiga'dirfj se»; that no cartridge remains 
in the chamber, pull trigger and set selector on "Safe, 



ii 



IX. INSPECTION, ADJUSTMENT, AND REPAIR 

A. GENERAL 

The adjustments and repairs, desci/bed in this section, should be 
performed only by Ordnance personnel or skilled gunsmiths. 

It is important, that this weapon be in proper adjustment to oper- 
ate at its maximum efficiency. When all parts are in correct ad- 
justment such stoppages as occur are usually due to faulty ammuni- 
tion or improper lubrication (excessive or insufficient) . The inspec- 
tion for correct adjustment will be considered in regard to the posi- 
tion oi the selector, each part being explained separately. Suggested 
remedies or repairs will follow each part. 

Remove Stock before beginning inspection. 



1 2 Cases, carry inn 5 -pocket t.sp-p per bub. are furnished for rumba t organizations. 



16 



R SELECTOR SET AT *S. A." 

With barrel down, muzzle to left, work action bar with left hand- 
snapping trigger with right thumb. Work action bar several times! 
There should be no binding and a minimum of looseness and side- 
play. Bolt should lock fully. Pull trigger and note position of 
connector. The selector extension should hold the connector hook 
at least one-sixteenth inch from action bar. Cock piece and snap 
trigger, maintaining pressure on trigger. Recock and release trigger 
slowly. The disconnector should reengage the sear without hesita- 
tion. Forward tip of disconnector should lay on the action bar, hold- 
ing disconnector slightly above sear shelf, yet allowing sear' notch 
to engage with sear. Trigger extension should not foul disconnector. 
D&feets and remedies, — 

Action bar binding Shoulders of magazine guide posts are below level of side 

members of action tar. Peen shoulders to bring them 
above action bar. Dress with file. 

Action bar loose Shoulders of magazine guide posts are too high Dress 

with file. 

— Squeeze side members of action bar in vise to fit niaga- 
( lateral play) sine guide posts. 

Bolt does not lock— Inspect action bar notch in magazine guide poet. Dress 

front part with file, if barred. Inspect locking shoulder 
for burrs or foreign matter. 

Connector fouis action bar 



( vertical play ) 
Action bar loose 



Disconnector binds 

Disconnector tip awsiy from action 
bar. 



Bend selector eitension to lift connector. 

Straighten disconnector. Smooth hearing 
surfaces of parts. 

Insert rod forward of sear under dis- 
connector to hold disconnector up. 
Strike tip of disconnector. 
Disconnector not on sear Fit disconnector to sear bv filing notch 

deeper or cutting down nose. 
Trigger extension fouls disconnector... Bend trigger extension to clear discon- 
nector by clamping trigger in vise and 
striking extension a light blow. 

C. SELECTOR SET AT "F. A." 

Holding trigger back feightij with right thumb, drive aetion bar 
smartly to rear and allow to snap forward. Bolt should he in a 
fully locked position. Connector hook should be in connector recess 
in action bar. End of selector extension should not foul lug on 
connector. Trigger extension should not foul disconnector or con- 
nector. Rear of sear should not strike disconnector where attached 
to trigger. Sear should have forward play. Retract action bar and 
allow to move forward slowly, right thumb pressing trigger. Con- 
nector hook should not contact any part of action bar except rear 
of connector recess. Before action bar has gone forward enough for 
connector to engage in connector recess, release trigger and action 
bar simultaneously. Connector should not engage in action bar. 

17 



L 



Defect* and remedies.— 

licit does not lock Sa*e aB in *S. A." 

Conner Jumps «t of action bar— Check for parts fouling or tfndtag .Be 

move any burrs an connector noofc, 
connector recesH In action bar and ac- 
tion bar notch in magazine gnl*s post 
Note.— The r a dine flled Bt the bottom 
of the connector nook MUST be pre- 
served. The common tapered file with 
its serrated edges is utilized at the 
factory. 
Selector extension fouls connector Bend extension forward. 

"lug 

Hear of hmlt fouls disconnector File clearance in dlsconnectoT. 

Trigger extension foula disconnector Bend extension to clear. 

or connector 
Scar Has no forwa^ play in fired Round front of sear. 

position. . 

Connects hoot fouls sectton of m- me connector hook to dear. 

tion bar that enters action bar 

notch in magazine guide post. *_i~~, r «m* 

sector engages action bar, trigger U>ok for parts banding m trigger and 

being released. Beaf mechanism. 

R SELECTOR SET AT "SAFE" 

Selector should move easily yet with positive stops on settings. 

Clicks should be audible Selector extension should cam disconnector 
out of engagement with sear, and block movement of connector as 
in *& A." 
Defects md remedies. — 

Selector stiff— Il4 ' a,n out scrpw holes in ! * lector s P rin «- 

Selector slides over Bettings Remove selector spring and bend for more 

tension. 

Clicks inaudible. ■- Above remedy applies. 

Selector jams on disconnector Bend selector extension and smooth cam 

surface of disconnector. 

E. SUMMARY 

It can readily be seen that for the proper operation of the piece there 
tan be no binding in the action from parts being out of adjustment 
and fouling each other. The mechanism should be adjusted correctly 
by Ordnance personnel or skilled gunsmiths before the gun is put into 
service, and with normal care this correct adjustment ^iU be 

maintained. 

Work carefully if it is found necessary to bend the selector exten- 
sion as this part is case-hardened and liable to break. Should the 
selector break, the piece may still be fired, the type of fire being full 
automatic. Bursts of two or three shots may be fired with the weapon 
in this condition, the release of the trigger causing the immediate 
suspension of fire. 

18 






Should the connector be lost while cleaning in the field, the piece 
wiU fixe semiautomatic only. 

Although the extractor may be broken, the weapon may continue 
to extract and eject through the force of residual pressure as the bolt 
moves to the rear. 

F- TABLE OF DEFECTS AND REPAIRS 

[Note.— Repairs should be made by Ordnance personnel or skilled gunsmiths] 



Set at— 



S. A. 



S. A, 



Defect 



Failure to fire. 



do 



S. A. 
S. A. 

S. A. 

S. A. 



F. A. 



F. A. 



F. A. 



F. A. 



do 



do. 



V. A. 



Uncontrolled fire. . 



Safe 

Safe 
Safe 



Selector stiff. 



Selector loose. 



Clicks inaudible. 



I 



Cause 



Action bar binds 



Bolt does not lock 



Fires full auto- 
matic. 

Fires 1 shot only, . 



do 

Selector -won't 

move to "Safe." 



Selector iron 'I 

move to "Safe," 
piece not cocked. 
Firing interrupted. 



Connector fouls ac- 
tion bar and en- 
gages with it. 

Disconnector binds; 

does not reengage 
sear. 

Tri gger extension 
fouls disconnector. 

Selector jams on dis- 
connector. 



Selector fouls on con- 
necter lag. 

Connector disengages 
from action bar. 



Selector extension 
fouls connector 

Connector hook f ouls 
section of action 
bar that enters 
notch in magazine 
guide post. 

Connect o r eng a g e s 

action bar, trigger 
being released. 

Screw holes too tight 

in spring. 
Selector spring weak. 

— .do™ 



19 



Repair 



Peen up shoulders of maga- 
zine guide posts and dress 
evariy vrith file. 

Dress with file front part of 
action bar notch in maga- 
sine guide post if burred. 
Remove foreign matter or 

burrs from locking shoul- 
der in receiver- 
Bend selector extension to 
lift connector. 

Straighten disconnector And 
smooth bearing surfaces of 
parte. 

Bend trigger extension to 

clear disconnector. 

Bend selector extension to 
cam disconnector freely, 
and smooth cam surface 
of disconnector. 

Hetraet action baT about \ i 
inch to allow connector to 
disengage from action liar. 

Check for parts fouling or 
binding. Look for burry 
on connector hook, con- 
nector rceess in action bar,. 
action bar notch in maga- 
zine guide post. Smooth 
burred parts. 

Bend extension forward. 



File connector to clear. 



Check for parts fouling or 
binding in trigger and 
sear mechanism and cor- 
rect. 

Ream out screw hole? in 
selector spriup;. 

Remove selector spring and 
bend for more tension. 
Do. 



NOTES— M55 PARACHUTE 

(1) To take «p looseness of the folding stock and latch.— Place 
butt end of wire stock on a. flat surface and strike lightly with 
hammer on the inside surface. Try and repeat until correct The 
latch should never be bent to take up any looseness. 

(2) Disconnector binding. — {ass&ribUd m stocks) .— Upon dis- 
mounting from stock, inspection of routing in stock, opposite the 
disconnector, may show the point which is rubbing. Trim excess 
wood with knife or wood chisel until action works freely. 

(3) In replacing the extractor screw. — Check to see that the shank 
does not extend enough to bind the firing pin. Dress shank end of 

screw to correct this. 

(4) If the holt should be held retracted or bind in ike rearmost 
poiitwn it may be temporarily corrected by loosening the bumper 
ping about one-half turn. As soon as practical, the bumper plug 

shank should be dressed back with a file and reduced about one- 
sistcenth inch for about one-half inch, or until binding is reduced. 
Cause: Bumper plug shank may be bent, and/or bumper plug threads 
in receiver may be out of line. 

(5) The sights may be calibrated to a true zero at any desired 
range by filing down the front sight to raise the center of impact 
or by deepening the cuts in the elevator to lower the center of 

impact. 



20 



ANNEX NO- 1 

LIST OF PARTS ARRANGED ACCORDING TO MANUFACTURER'S 

PIECE NUMBERS 



*CM>. 



50-L 
50-2. 
50-3. 

5i 

50-6. 
50-7. 
50-8. 
50-9. 

50-10. 
50-11. 
50-12. 

50-13. 
50-14. 

50-15. 

50-16. 
50-17. 
50-18. 

50-19, 
50-20. 
50-21. 
50-23. 
50-27. 
50-28. 
50-29. 

50-30. 
50-31. 

50-32. 
50-33. 
50-34. 
50-35. 
50-36. 
50^37. 
50-38. 
50-39. 
50-40. 



Action bar. 

Barrel. 

Bolt. 

Bolt pin. 

Bumper plug. 

Bumper ping plunger. 

Bumper plug plunger spring, 

Butt plate. 

Butt plate screw. 

Disconnector. 

XMsconnector spring. 

Disconnector pin. 

Ejector. 

Extractor. 

Extractor screw. 
Firing pin. 
Firing pin spring. 
Compensator. 
Front sight. 

Hammer. 
Hammer spring. 
Magazine. 
Magazine guide. 

Magazine guide pin. 

Magazine catch, 
Magazine catch screw. 
Rear sight. 

Magazine catch release. 

Rear sight elevator. 
Receiver. 

Receiver stud. 
Retracting spring guide. 
Retracting spring. 

Safety & fire selector. 
Safety screw. 
Safety spring. 

<2l> 



[ 



#M1. 
5<M2. 
50-43. 
50-45. 
50-46. 

50-47. 
50-48. 

5<M9. 
50-50. 



50-^2. 
50^53. 
50-54. 
50-65. 
50-57. 
50-58. 
50-59. 
50-74. 
50-7«. 
50-79. 
50-80. 
50-81. 
50-87. 
50-88. 
50-90. 
50-91. 
50-92. 

50-93. 

50-94. 
50-301. 

50-302. 

50^303. 

50-304. 

50-305. 

50-306. 

50-307. 

50-308. 

50-309. 

55-2- 

55-3. 

55-4. 

56-5. 



Sear. 

Sear spring. 

Take down screw lock washer. 

Take do wd screw. 

Trigger. 

Trigger & sear pin. 

Trigger spring. 

Trigger guard. 

Trigger guard screw. 

Automatic connector (without lift pin). 

(This number is assigned to this part until completed as an 

assembly.) 
Automatic connector spring. 
Escutcheon. 
Escutcheon pin. 

Retracting spring guide washer. 
Automatic connector pin. 
Automatic connector lift pin. 
Magazine catch lock stud. 
Strap (sling) - 
Swivel screw. 
Connector spring plunger. 

Trigger spring plunger. 
Magazine guide stop piu 
Stock tie screw. 

Stock tie screw nut. 

Bumper plug stem. 
Receiver stud filler washer. 
Stock tie screw (front). 
Trigger guard screw (rear). 
Magazine catch lock stud. 

Receiver assembly. 
Rough assembly. 
Finished assembly. 
Magazine guide assembly. 
Automatic connector assembly. 
Bolt & firing pin assembly. 
Disconnector & trigger assembly. 
Magazine guide assembly. 
Trigger & lift pin assembly. 
Barrel. 

Extractor spring clip. 
Extractor hinge plate. 

Extension butt clip. 



22 



55-6. 

55-9. 

55-10. 

55-11. 

55-12. 

55-13. 
55-14. 
55-15, 

55-16. 

55-17. 

55-m. 
55-302. 
55-303. 



(front) 



Extension spring clip screw. 
Sling screw for stock. 
Stock reinforcement bolt head. 
Stock reinforcement washer. 
Extension spring clip screw 
Extension butt clip screw. 
Extension hinge plate screw. 
Front sight screw. 
Stock extension. 

Ext. hinge plate screw nut. 
Receiver assembly. 
Rough assembly. 

Finished assembly ieys or wrenches. 



INDEX 



Accessories and spare parts, seta .... ■• 5 



Action, ImmediRte 

Adjustment, Inspection and repair 

Anns, Manual of (rules for carrying) 
Assembly, detailed 



Defects and repairs, table of. 
Description 

Disassembly, detailed 



14 
16 

1 
11 



Assembly, field , , ____ t .... 

Care and cleaning 

Carrying tb* Seising Habmaehine gun, rates for ~ 

Gleaning, care and 

Data, general 



12 

1 

12 

5 

1© 

__ . 2 

Disassembly, field ~~~2l~~ 10 

Functioning . - - - 

immediate action , 



13 
M 



inspection, adjustmett and repair 16 

Inspection, arms ~ _ 

Labrlcatior ~_I__ TH_"_~~ 

Misfire, immediate action on 

Nomenclature 

Operation _ """" "" "" 

Parachnte, M55 ~~ 

Parts, list <rf ------ 



1 

13 

14 

__ T 

. 3 

— 2ft 

_ , 21 

Parts, spare, sets ^ 5 

Precaations, safety _^" _^ 16 

Repair, Inspection and adjustment I~ ~ _ \_ 16 

Repairs, defects, table of '__ "__!__ 18 

Safety precautions.- _ ■*«» 

Salute when armed with Raising _ 2 

Selector, sett Logs of ~ - 

Sight, rear, adjustment of <_ ~~~' 3 

Stoppages _ _L_L~ 14 



23